How do I edit the legend when I have many entries (but only 2 types of data)

Question

10B 2016-7-13

0
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https://ww2.mathworks.cn/matlabcentral/answers/295445-how-do-i-edit-the-legend-when-i-have-many-entries-but-only-2-types-of-data

回答： Sharad Singhania 2019-7-14

Hello Community,

I have a presentation problem regarding a plot legend that I hope you can help with. This situation is that I plot a bar chart and need to identify a single bar with a different colour when the data hits certain conditions, coded as:

% raise figure
figure(1)
hold on
% set color bar
cm = [0.90 0.90 0.90; 0 0 0]; 
% run for loop to colour data individually & when data conditions are met
for i = 1:length(pltvar1srt)
    h=bar(i,pltvar1srt(i));
    if pltvar1srt(i) == 1.71 && 4
        set(h,'FaceColor',cm(1,:));
    else
        set(h,'FaceColor',cm(2,:));
    end
end
hold off

and this produces the plot I need:

The problem is when I add the legend, due to the way I have coloured the bar, I get many data entries:

Using the legend help, I have tried to write the legend using a variety of calls - all of which haven't worked unfortunately:

legend ([data1 data10]);
legend ([data data10]);
legend ([pltvar1srt.9 pltvar1srt.10]);
legend ([pltvar1srt(9) pltvar1srt(10)]);
legend ([cm(1,:) cm(2,:)], 'Data 1', 'Data 2');
% etc. etc.

but still no luck. I have also looked at this useful function - but again, couldn't get it to work in the way I needed.

I simply want the legend to have the two entries ie 'Black Data' and 'Grey Data' and be coloured appropriately.

Can anyone offer any help please?

Many thanks,

10B.

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10B 2016-7-19

Reading through various examples, I starting to think that 'hggroup' may be part of the solution, similar to the example here, the drawback is that I am not creating the plot in the same way.

I'm still working on this - but would be grateful of some help if possible!

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Answer 1

Thorsten 2016-7-19

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/295445-how-do-i-edit-the-legend-when-i-have-many-entries-but-only-2-types-of-data#answer_229114

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    if pltvar1srt(i) == 1.71 && 4
        set(h,'FaceColor',cm(1,:));
        hlegend(1) = h;
    else
        set(h,'FaceColor',cm(2,:));
        hlegend(2) = h;
    end